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Sediments and sedimentary rocks (Pleistocene and Pliocene).

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Older gravel, sand, and silt deposited in fans, streams, and lakes. Includes older terrace gravels and Tuana Gravel northwest of Twin Falls. (Quaternary to Eocene Continental Sediments and Sedimentary Rocks).
State Idaho
Name Sediments and sedimentary rocks (Pleistocene and Pliocene).
Geologic age Pleistocene and Pliocene
Lithologic constituents
Major
Unconsolidated > Fine-detrital > Silt (Alluvial, Fluvial, Lacustrine)
Unconsolidated > Coarse-detrital > Gravel (Alluvial, Fluvial, Lacustrine, Terrace)
Unconsolidated > Coarse-detrital > Sand (Alluvial, Fluvial, Lacustrine)
References

Lewis, Reed S., Link, Paul K., Stanford, Loudon R., and Long, Sean P., Geologic Map of Idaho, 2012, Idaho Geological Survey, Geologic Map 9 (M-9); Scale 1:500,000.
NGMDB product
Counties Ada - Bingham - Blaine - Boise - Bonneville - Butte - Camas - Canyon - Caribou - Clark - Custer - Elmore - Franklin - Gem - Gooding - Idaho - Lemhi - Oneida - Owyhee - Payette - Twin Falls - Washington